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Designation of phase differences by hour numbers in three-phase AC systems
Designation of phase differences by hour numbers in three-phase AC systems is a method used to describe the relative phase positions of the voltages or currents.
In this system, the phase difference between any two phases is represented as an angle on a clock face, with one hour corresponding to 30 degrees.
This approach provides a clear and intuitive means of communicating phase relationships, especially in complex wiring and analysis tasks.
IEC 60152:2021 specifies methods and rules for the designation of phase difference between two items in a three-phase AC system. The designations are intended to be applied in the technical documentation of industrial installations, equipment, and products, and also on markings of equipment and products.
IEC 60152:2021 cancels and replaces the first edition published in 1963. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
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